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working response streaming

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ading2210 2024-03-08 17:00:20 -05:00
parent e211e8bf8c
commit 33ac41ae33
5 changed files with 159 additions and 47 deletions
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61
client/javascript/main.js
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@ -43,10 +43,11 @@ function check_loaded(check_websocket) {
}
//low level interface with c code
function perform_request(url, params, js_data_callback, js_end_callback, body=null) {
function perform_request(url, params, js_data_callback, js_end_callback, js_headers_callback, body=null) {
let params_str = JSON.stringify(params);
let end_callback_ptr;
let data_callback_ptr;
let headers_callback_ptr;
let url_ptr = allocate_str(url);
let params_ptr = allocate_str(params_str);
@ -57,29 +58,36 @@ function perform_request(url, params, js_data_callback, js_end_callback, body=nu
body_length = body.length;
}
let end_callback = (error, response_json_ptr) => {
let response_json = UTF8ToString(response_json_ptr);
let response_info = JSON.parse(response_json);
function end_callback(error) {
Module.removeFunction(end_callback_ptr);
Module.removeFunction(data_callback_ptr);
if (body_ptr) _free(body_ptr);
_free(url_ptr);
_free(response_json_ptr);
Module.removeFunction(headers_callback_ptr);
active_requests --;
js_end_callback(error, response_info);
js_end_callback(error);
}
let data_callback = (chunk_ptr, chunk_size) => {
function data_callback(chunk_ptr, chunk_size) {
let data = Module.HEAPU8.subarray(chunk_ptr, chunk_ptr + chunk_size);
let chunk = new Uint8Array(data);
js_data_callback(chunk);
}
end_callback_ptr = Module.addFunction(end_callback, "vii");
function headers_callback(response_json_ptr) {
let response_json = UTF8ToString(response_json_ptr);
let response_info = JSON.parse(response_json);
if (body_ptr) _free(body_ptr);
_free(url_ptr);
_free(response_json_ptr);
js_headers_callback(response_info);
}
end_callback_ptr = Module.addFunction(end_callback, "vi");
headers_callback_ptr = Module.addFunction(headers_callback, "vi");
data_callback_ptr = Module.addFunction(data_callback, "vii");
let http_handle = _start_request(url_ptr, params_ptr, data_callback_ptr, end_callback_ptr, body_ptr, body_length);
let http_handle = _start_request(url_ptr, params_ptr, data_callback_ptr, end_callback_ptr, headers_callback_ptr, body_ptr, body_length);
_free(params_ptr);
active_requests ++;
@ -167,24 +175,33 @@ async function create_options(params) {
//wrap perform_request in a promise
function perform_request_async(url, params, body) {
return new Promise((resolve, reject) => {
let chunks = [];
let data_callback = (new_data) => {
chunks.push(new_data);
let stream_controller;
let stream = new ReadableStream({
start(controller) {
stream_controller = controller;
}
});
function data_callback(new_data) {
stream_controller.enqueue(new_data);
};
let finish_callback = (error, response_info) => {
function headers_callback(response_info) {
let response_obj = create_response(stream, response_info);
resolve(response_obj);
}
function finish_callback(error) {
if (error != 0) {
let error_str = `Request failed with error code ${error}: ${get_error_str(error)}`;
if (error != 0) error_msg(error_str);
reject(error_str);
return;
}
let response_data = merge_arrays(chunks);
chunks = null;
let response_obj = create_response(response_data, response_info);
resolve(response_obj);
stream_controller.close();
}
perform_request(url, params, data_callback, finish_callback, body);
perform_request(url, params, data_callback, finish_callback, headers_callback, body);
});
}